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Kent's HD Chemical Demonstrations

HD- Gummy Bear Execution Video

This energetic video demonstration can be used to visualize the amount of energy contained in a single piece of candy...a gummy bear.

Copper Initiated Nitric Acid Fountain

A few copper cents are dropped into concentrated (14M) Nitric Acid. Nitric acid is an oxidizing acid and reacts with copper by the following exothermic redox reaction occurs:

3Cu(s) + 8HNO3(aq) → 3Cu(NO3)2(aq) + 2NO(g) + 4H2O(l)

When exposed to oxygen, NO is converted into nitrogen dioxide.
2 NO + O2 → 2 NO2

The other possible reaction where NO2 is formed instead of NO:
4 HNO3 + Cu → Cu(NO3)2 + 2 NO2 +2 H2O

   

 
HD 2010 Dry Ice And Magnesium
Magnesium ribbon and turnings are placed into the center of a block of dry ice and ignited. This energetic reaction produces Magnesium Oxide and elemental carbon.
2Mg + CO2
C +2MgO

Bubbles Filled with Fog

 

Dry ice is dropped into a flask and a one holed rubber stopper with a thistle tube on the end is dipped into soap. The fog from the dry ice fills the bubble and can be held and even tossed using microfiber gloves.

 
Creating a Monster Soap Bubble Dry Ice for Halloween

Dry Ice (solid carbon dioxide) is dropped into a large tub of warm water. A cotton rope is soaked in soap and slowly dragged across the rounded lid. As the dry ice sublimes (turns from a solid to a gas) the bubble expands and eventually

Ammonium Dichromate Volcano

Ammonium Dichromate is a somewhat compact orange solid that when heated decomposes into a green solid Chromium(III) Oxide( that appears to grow in size) along with nitrogen and stream. You can see why this reaction is called a volcano reaction.
The reaction
(NH4)2Cr2O7(s) → Cr2O3(s) + N2(g) + 4 H2O(g) (ΔH=−429.1 kcal/mol)

 

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